[quote=Alphakoka]
I'm more partial on Red, Purple, Pink. Red the purist look at purple the hybrid and water clear everything.
[/quote]

I was actually partial to this view, myself. Purples seems more like a hybrid, and plant is also a hybrid of the resources that are water and sun.

The riddle says "[b]purist sight[/b]" (red) "[b]to [i]its[/i][/b]" (as in red's) "[b]hybrid[/b]" (purple) "[b]with another[/b]" (pink, which is just some other colour). However, pink could also be seen as a hybrid of red and white, though I would see that as more of a variation. This takes it to mean that "[b]with another[/b]" is a separate item, not a descriptor of the hybrid.

The riddle [i]also[/i] says "[b]purist sight[/b]" (sun, think of the Allegory of the Cavern) "[b]to [i]its[/i][/b]" (as in the sun's) "[b]hybrid[/b]" (plant) "[b]with another[/b]" (water, because sun+water makes plant). Also, as Alpha mentioned, water is clear, but I'm not so sure that is part of the riddle itself. This takes it to mean that "[b]with another[/b]" is a descriptor of the hybrid.